An estimation method of full scale performance for pulling type podded propellers
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This paper presents a new estimation method of full scale propulsive performance for the pulling typepodded propeller. In order to estimate the drag of pod housing, a drag velocity ratio, which includes the effects ofpodded propeller loading and Reynolds number, is presented and evaluated through the comparison of model test andnumerical analysis. By separating the thrust of propeller blade and the drag of pod housing, extrapolation method ofpod housing drag to full scale is deduced, and correction method of propeller blade thrust and torque to full scale ispresented. This study utilized the drag coefficient ratio of the pod housing as a measure for expanding it to full scale,but in order to increase the accuracy of performance evaluation, additional study is necessary on the method for the fullscale expansion via separating the drag of pod body, strut and fin which consist the pod housing.
Abstract
This paper presents a new estimation method of full scale propulsive performance for the pulling typepodded propeller. In order to estimate the drag of pod housing, a drag velocity ratio, which includes the effects ofpodded propeller loading and Reynolds number, is presented and evaluated through the comparison of model test andnumerical analysis. By separating the thrust of propeller blade and the drag of pod housing, extrapolation method ofpod housing drag to full scale is deduced, and correction method of propeller blade thrust and torque to full scale ispresented. This study utilized the drag coefficient ratio of the pod housing as a measure for expanding it to full scale,but in order to increase the accuracy of performance evaluation, additional study is necessary on the method for the fullscale expansion via separating the drag of pod body, strut and fin which consist the pod housing.
참고문헌 (6)
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- Holtrop, J., "Extrapolation of propulsion tests for ships with appendages and complex propulsors", Marine Technology, 38(3), pp.145~157 (2001)
- ITTC, "The specialist committee on unconventional propulsors, final report and recommendations to the 22nd ITTC", Proceedings of the 22nd ITTC, pp.311~344 (1999)
- ITTC, "The specialist committee on azimthing podded propulsion : final report and recommendations to the 24th ITTC", Proceedings of 24th ITTC, pp.543~600 (2005)
- Lobatchev, M.P., "The fullscale resistance estimation for podded propulsion system by RANS method", Lavrentiev Lectures, Proceeding of International Symposium on Ship Propulsion, pp.39~44 (2001)
- Sanchez-Caja, A., "Simulation of incompressible viscous flow around a tractor thruster in model and full scale", The 8th International Conference on Numerical Ship Hydrodynamics, pp.1~11 (2003)